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Leisure Battery Charging. Riddle me this...

MattBW

MattBW

Here to help
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5,994
Location
Bedworth, United Kingdom
Vehicle
T5 Beach
Thanks for letting us know the resolution, great to hear its fixed and it is likely to help future members too! :D Great result.
 
Burcu

Burcu

Messages
3
Location
Belgium
Vehicle
T6 Ocean 150
2012 SE California.
Leisure batteries both new.
Leisure batteries charge on EHU
They don't charge when van driven.
Van is not a bluemotion.
Central control panel does show the G in circle when being driven.
Obvious place to check first is the Split Charge Relay.
I've done some testing with a meter, and the split charge relay appears to works.
The engine battery is only showing 12.4v despite a 700 mile drive last week, so low?
The engine battery charge increases to 13.6V with engine running, so I deduce the alternator is working.
With engine off. The input to the relay from the engine battery is showing 12.4V.
The output, to the leisure batteries is showing the same, 12.4V.
With the engine running, the input to the relay doesn't change, it remains at 12.4V, it doesn't increase to the 13.6V the engine battery is showing (with alternator) which you would expect?
So the leisure batteries are not being charged when the engine is running.
They do charge on EHU.
I'm at a loss to work out what's going on, so really appreciate any assistance.
All I can think is that the engine battery is not achieving sufficient charge for the power to divert to the leisure batteries. Is there a smart module between the engine battery and leisure battery relay which stops any charge divert unless the engine battery is optimised for charge?
Thanks for any advice.
Hello, I am having a very similar problem. I have a T6 Ocean registered April 2019.

I am having multiple problems with the battery, some* similar to yours listed below.
1) When hooked up it charges up to 12.7V maximum.
2)* After a 250 km drive it charges up to 12.4V maximum.
3) It does not hold the charge, drains to 12.2V or 12.1V after 1 day of wild camping.
4) It had extreme fluctuations and drained while driving although 'G' was displayed. The values on display would go to negative and the batteries got drained instead of charged after starting the motor or driving. e.g. 12.4V before starting the engine, 12.3V after starting the engine. The engine battery charge increases to 13.6V with engine running, so alternator was not the problem.

I am living in Belgium and I asked Group DeLorge in Hasselt to look into these problems. They told that the battery levels are normal (regarding issues 1, 2 and 3) and as long as they do not drop below 12.0V it would not be changed under guarantee. They also told fluctuations (regarding issue 4) are normal while driving and they did not even gave an appointment to check the issue.

After this, I contacted a specialist VW garage in Ghent named Van hoe & zonen. They accepted that the battery is not acting normal and looked into it for a month, even getting step by step help from Germany since it is a rare issue. Alternator and all batteries were checked. In the end they told they put a box below the passenger seat (which used to be present in T5 but not normally in T6) that separates the leisure batteries from the engine battery which seem to fixed the drain while driving issue (now it displays zero rather than negative values). They told even they are having trouble with VW to get the guarantee expenses covered because VW claims this is an edge case issue and is not related to fabrication. We really appreciated their help.

However my problems about the battery level are still there (issues 1, 2, 3) and they are not fixed. The battery is not charged to high levels and it does not hold the charge. Nothing compared to when we first bought it. This worry over battery has been ruining our recent trips.

I am in-between these options
1) Going after VW to get those issues fixed,
2) Get it fixed myself as long as it is under 500 EUR, or do not do any investment in leisure batteries since they are not reliable.
3) Get a separate portable solar generator and solar panel instead, something like Ecoflow River Pro to charge all our electronic appliances, since the VW battery performance is this low. This will cost me around 1000 EUR.

I wanted to ask you what would you choose to do.
How did you exactly fix it, was it an easy fix?
I am not knowledgeable with electronics, so I wanted to get your opinion.
 
Perfectos

Perfectos

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Messages
3,532
Location
Hertfordshire
Vehicle
T6 Beach 150
Hi I had very similar issues on a 2018 Beach.
Starter battery was not holding charge and failed to start the van on several occasion.
initially dealer checked the battery, said there was no issue with the battery, despite it being 12.2v after two hours driving!

long story short, I contacted the dealer after sales manager, explained the situation fully.
van went back in to have a full factory hook up diagnostics check.

outcome:
“Battery fault, defect identified with earth strap, replaced strap and battery, carried out basic settings and adaptions“

approx 8 months later the alternator failed !

all replaced under warranty,
 
WelshGas

WelshGas

Retired after 42 yrs and enjoying Life.
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Messages
19,754
Location
United Kingdom
Vehicle
T5 SE 180 4Motion
Hello, I am having a very similar problem. I have a T6 Ocean registered April 2019.

I am having multiple problems with the battery, some* similar to yours listed below.
1) When hooked up it charges up to 12.7V maximum.
2)* After a 250 km drive it charges up to 12.4V maximum.
3) It does not hold the charge, drains to 12.2V or 12.1V after 1 day of wild camping.
4) It had extreme fluctuations and drained while driving although 'G' was displayed. The values on display would go to negative and the batteries got drained instead of charged after starting the motor or driving. e.g. 12.4V before starting the engine, 12.3V after starting the engine. The engine battery charge increases to 13.6V with engine running, so alternator was not the problem.

I am living in Belgium and I asked Group DeLorge in Hasselt to look into these problems. They told that the battery levels are normal (regarding issues 1, 2 and 3) and as long as they do not drop below 12.0V it would not be changed under guarantee. They also told fluctuations (regarding issue 4) are normal while driving and they did not even gave an appointment to check the issue.

After this, I contacted a specialist VW garage in Ghent named Van hoe & zonen. They accepted that the battery is not acting normal and looked into it for a month, even getting step by step help from Germany since it is a rare issue. Alternator and all batteries were checked. In the end they told they put a box below the passenger seat (which used to be present in T5 but not normally in T6) that separates the leisure batteries from the engine battery which seem to fixed the drain while driving issue (now it displays zero rather than negative values). They told even they are having trouble with VW to get the guarantee expenses covered because VW claims this is an edge case issue and is not related to fabrication. We really appreciated their help.

However my problems about the battery level are still there (issues 1, 2, 3) and they are not fixed. The battery is not charged to high levels and it does not hold the charge. Nothing compared to when we first bought it. This worry over battery has been ruining our recent trips.

I am in-between these options
1) Going after VW to get those issues fixed,
2) Get it fixed myself as long as it is under 500 EUR, or do not do any investment in leisure batteries since they are not reliable.
3) Get a separate portable solar generator and solar panel instead, something like Ecoflow River Pro to charge all our electronic appliances, since the VW battery performance is this low. This will cost me around 1000 EUR.

I wanted to ask you what would you choose to do.
How did you exactly fix it, was it an easy fix?
I am not knowledgeable with electronics, so I wanted to get your opinion.
Firstly a little more information.
Was the vehicle a new order or a demonstration vehicle when purchased?
What items are you running off the Leisure battery when wildcamping? A VW Coolbox or a compressor fridge or anything else?
I'm not sure if you realise but because of the smart alternator/regenerative Braking and Stop Start then the engine battery and Leisure Battery will normally not be charged to more than 80% capacity by the engine alternator whilst driving. This is normal but can be bypassed by switching on the headlights.
Also, for the above reason, that is why VW recommend plugging into Mains to fully charge the Leisure battery on a monthly basis as stated in the Handbook.
The variable voltages you see on driving are due to the actions of regenerative Braking, Stop Start and the smart charging system.
 
T

TwistyA

Messages
4
Location
Cheshire
Vehicle
T6 Ocean 150
Firstly a little more information.
Was the vehicle a new order or a demonstration vehicle when purchased?
What items are you running off the Leisure battery when wildcamping? A VW Coolbox or a compressor fridge or anything else?
I'm not sure if you realise but because of the smart alternator/regenerative Braking and Stop Start then the engine battery and Leisure Battery will normally not be charged to more than 80% capacity by the engine alternator whilst driving. This is normal but can be bypassed by switching on the headlights.
Also, for the above reason, that is why VW recommend plugging into Mains to fully charge the Leisure battery on a monthly basis as stated in the Handbook.
The variable voltages you see on driving are due to the actions of regenerative Braking, Stop Start and the smart charging system.
Hi. I am having a similar problem on my 2017 Ocean. The battery charges fully off the electric hook up, however when driving only reaches 40%. I'm about to go in holiday and won't have a hook up so any help would be greatly appreciated! Thanks

16272451746056716919743471126402.jpg

16272452060705147610907364365341.jpg
 
Loz

Loz

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Messages
5,456
Location
Berkeley Gloucestershire
Vehicle
T6 Ocean 204 4Motion
First check the 80A fuse under the passenger seat then check the main 100a fuse in the ebox under the main starter battery that supplies the relay under the passenger seat.
1.Fuses-SH(ocean).png
2.
Fuse_Box_A.jpeg
 
WelshGas

WelshGas

Retired after 42 yrs and enjoying Life.
Top Poster
Lifetime VIP Member
Messages
19,754
Location
United Kingdom
Vehicle
T5 SE 180 4Motion
Hi. I am having a similar problem on my 2017 Ocean. The battery charges fully off the electric hook up, however when driving only reaches 40%. I'm about to go in holiday and won't have a hook up so any help would be greatly appreciated! Thanks

View attachment 81975

View attachment 81976
Exactly what @Loz has said above.

Ignore the % reading. It is a computerised calculation and quit iffy and is reset each time the panel is rebooted . The Voltage is accurate though.

Your pictures would indicate that the Control Panel is receiving a signal input from the alternator, but not a charging voltage.
So check the Fuses.
If fuses OK, then check the Split Charge Relay.
Lastly if all the above are OK, the alternator wiring to split charge relay should be examined. If the alternator had failed you would have more immediate problems.
 
Wesel

Wesel

VIP Member
Messages
409
Location
Belgium
Vehicle
T6 Coast 150 4Motion
Maybe it's useful to have such a 100 amp fuse in the car?
What model is it? Is it difficult to change?
 
T

TwistyA

Messages
4
Location
Cheshire
Vehicle
T6 Ocean 150
My is a T6 Ocean 150. Fuse is under the starter battery so you have to take that battery out to get to the fuses. Not difficult but not immediately accessible. I have spares now in the van in case it happens again but it has been fine for the last 4 years.
 
Wesel

Wesel

VIP Member
Messages
409
Location
Belgium
Vehicle
T6 Coast 150 4Motion
My is a T6 Ocean 150. Fuse is under the starter battery so you have to take that battery out to get to the fuses. Not difficult but not immediately accessible. I have spares now in the van in case it happens again but it has been fine for the last 4 years.
Is it like this ?
143249_pic1.jpg
 
K

Kjetil

Messages
58
Location
Sweden
Vehicle
T5 SE 130
Thanks everyone. I might have that same issue with my 2005 Cali SE.
 
K

Kjetil

Messages
58
Location
Sweden
Vehicle
T5 SE 130
Thanks everyone. I might have that same issue with my 2005 Cali SE.
False alarm! I noticed a negative current of about 0,2-0,4 and 12,6V despite the G symbol. But this occurred after a 540+ km trip. Today after the cars been standing a couple of days the charging is about 10A and the Volt 14,1 again. Everything seem OK. But thanks for the comments. My turn next time for some real problem solving.
 

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